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281.
Environment, Development and Sustainability - Environmental degradation has become an important issue for countries worldwide due to increase in carbon emission in recent years. It is an important... 相似文献
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285.
Irfan A. Khan 《Journal of the American Water Resources Association》1980,16(5):866-873
ABSTRACT: A solution procedure to solve the inverse problem in ground water, based on lumped approach, has been proposed. The method has the following advantages: 1) exact determination of the boundary conditions and the physical laws of flow through porous media is not required; 2) all errors of approximation in describing the boundary conditions, physical laws, and the aquifer properties are lumped into the surrogate parameters; and 3) the same mathematical model can be employed both in the identification process and in the subsequent management studies. The optimal values of the surrogate parameters are found by using a multidimensional unconstrained optimization code devised by Powell. The solution procedure and the convergence characteristics of the proposed algorithm have been illustrated by two hypothetical problems. 相似文献
286.
M Khan 《Journal of environmental science and health. Part. B》1983,18(6):781-793
5-Bromoindole carboxylic acid and substituted indoles were administered parenterally to hamsters infected with an Egyptian strain of S. mansoni, to assess their antischistosomal activity. 5-Bromoindole showed a significant hepatic shift in 59 percent of treated hamsters. The results suggest that modification of the indole nucleus may produce a series of antischistosomal agents. 相似文献
287.
Kabir-Ur-Rahman Khan 《Resources Policy》1983,9(4):300
288.
Ming YangFaisal I. Khan Rehan SadiqPaul Amyotte 《Journal of Cleaner Production》2011,19(13):1513-1526
Activities in offshore oil and gas (OOG) that cause environmental impacts can be systematically managed through an environmental management system (EMS). Environmental performance evaluation (EPE) is an essential part of an EMS. However, previous studies on EPE indicate that existing lists of indicators little insight into how indicators are modified to more accurately assess environmental performance.In this paper, a way is proposed to identify and define specific environmental performance indicators on a case-by-case basis, which consists of five steps: (1) describing environmental requirements; (2) determining favourable outcomes corresponding to the requirements; (3) identifying required activities or issues to achieve the outcomes; (4) searching for proper measures of the activities or issues; and (5) generating a list of key indicators. Based on these steps, a quality function deployment (QFD) approach is developed to determine key indicators and evaluate environmental performance. To handle uncertainties in QFD, the decision makers’ evaluations are quantified through rough numbers using the concept of rough sets. The outputs of the proposed approach are different environmental performance indices. Using these indices, decision makers can easily determine whether an improved performance has been achieved through an EMS. The proposed approach is transparent and promising for use as a unified tool for EPE. An application of the proposed approach is demonstrated through a numerical example. 相似文献
289.
Qixing Du Yanmei Gong Muhammad Arif Khan Daixin Ye Jianhui Fang Hongbin Zhao Jiujun Zhang 《绿色能源与环境(英文)》2022,7(1):16-34
Zn-air batteries (ZABs), especially the secondary batteries, have engrossed a great interest because of its high specific energy, economical and high safety. However, due to the insufficient activity and stability of bifunctional electrocatalysts for air-cathode oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) processes, the practical application of rechargeable ZABs is seriously hindered. In the effort of developing high active, stable and cost-effective electrocatalysts, transition metal nitrides (TMNs) have been regarded as the candidates due to their high conductivity, strong corrosion-resistance, and bifunctional catalytic performance. In this paper, the research progress in TMNs-based material as ORR and OER electrocatalysts for ZABs is discussed with respect to their synthesis, chemical/physical characterization, and performance validation/optimization. The surface/interface nanoengineering strategies such as defect engineering, support binding, heteroatom introduction, crystal plane orientation, interface construction and small size effect, the physical and chemical properties of TMNs-based electrocatalysts are emphasized with respect to their structures/morphologies, composition, electrical conductivity, specific surface area, chemical stability and corrosion resistance. The challenges of TMNs-based materials as bifunctional air-cathode electrocatalysts in practical application are evaluated, and numerous research guidelines to solve these problems are put forward for facilitating further research and development. 相似文献
290.
Dzumbira Walter Ali Nisar Duanmu Chuansong Yang Yong Khan Adnan Ali Farman Bilal Muhammad Aleya Lotfi Iqbal Hafiz M. N. 《Environmental science and pollution research international》2022,29(4):4822-4842
Environmental Science and Pollution Research - Metal–organic frameworks (MOFs) are a polymer hybrid family of compounds comprising metal ions that have been deliberately incorporated in... 相似文献